SDSS J0100+1818透镜群精确质量建模的宇宙学:三个不同红移的五个源

IF 5.4 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
A. Bolamperti, C. Grillo, G. B. Caminha, G. Granata, S. H. Suyu, R. Cañameras, L. Christensen, J. Vernet, A. Zanella
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引用次数: 0

摘要

在不同红移的多个源被同一个偏转器强烈透镜化的系统中,人们可以直接研究角直径距离作为红移函数的演变,从而了解宇宙的几何形状。我们通过对SDSS J0100+1818进行详细的强透镜分析,测量了总物质密度Ωm和暗能量状态参数方程w的值。SDSS J0100+1818是一个群尺度系统,z = 0.581,有5个透镜源,从z = 1.698到4.95。我们利用超大望远镜上的多单元光谱探测器(MUSE)的新光谱数据,安全地测量了65个源的红移,包括5个多重成像背景源(透镜共18个多重图像)和19个偏转面星系,所有这些都使用GLEE软件建立了稳健的强透镜模型。偏转器的总质量分布以一种相对简单的方式描述,包括一个扩展晕,最亮的星系群(BGG),测量到的恒星速度色散为(380.5±4.4)km s−1,以及较暗的成员。我们在平坦的Λ冷暗物质(CDM)模型和平坦的wCDM模型中进行测量。考虑到不同光源在投影上的角度接近,我们通过多平面方法量化它们对宇宙学参数推断值的影响。我们得到一致的中值,只有Ωm的不确定性增加了大约1.5倍。由于观测到的多幅图像的径向间隔非常宽,从BGG的15到77 kpc不等,我们精确地测量了总质量剖面,并推断出偏转器的恒星总质量剖面。在50 kpc内,它们的总质量为(1.55±0.01)×1013 M⊙,而在R≈77 kpc处,恒星的总质量分布从BGG有效半径处下降到(6.6±1.1)%。我们的结果证实,SDSS J0100+1818是已知中红移最大的星系之一,也是最遥远的候选化石系统之一。我们还表明,在不同红移处充当≥3个背景源透镜的群体尺度系统使人们能够估计宇宙学参数Ωm和w的值,其精度与从透镜星系团获得的值具有竞争力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cosmography from accurate mass modeling of the lens group SDSS J0100+1818: Five sources at three different redshifts
Systems where multiple sources at different redshifts are strongly lensed by the same deflector allow one to directly investigate the evolution of the angular diameter distances as a function of redshift, and thus to learn about the geometry of the Universe. We present measurements of the values of the total matter density, Ωm, and of the dark energy equation of state parameter, w, through a detailed strong lensing analysis of SDSS J0100+1818, a group-scale system at z = 0.581 with five lensed sources, from z = 1.698 to 4.95. We take advantage of new spectroscopic data from the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope to securely measure the redshift of 65 sources, including the 5 multiply imaged background sources (lensed into a total of 18 multiple images) and 19 galaxies on the deflector plane, all employed to build robust strong lensing models with the software GLEE. The total mass distribution of the deflector is described in a relatively simple way, and includes an extended halo, the brightest group galaxy (BGG) with a measured stellar velocity dispersion of (380.5 ± 4.4) km s−1, and fainter members. We measure in a flat Λ cold dark matter (CDM) model, and and in a flat wCDM model. Given the presence of different sources angularly close in projection, we quantify through a multiplane approach their impact on the inferred values of the cosmological parameters. We obtain consistent median values, with uncertainties for only Ωm increasing by approximately a factor of 1.5. Thanks to the remarkably wide radial interval where the multiple images are observed, ranging from 15 to 77 kpc from the BGG, we accurately measure the total mass profile and infer the stellar over total mass profile of the deflector. They result in a total mass of (1.55 ± 0.01)×1013 M within 50 kpc and a stellar over total mass profile decreasing from at the BGG effective radius to (6.6 ± 1.1)% at R ≈ 77 kpc. Our results confirm that SDSS J0100+1818 is one of the most massive (lens) galaxies known at intermediate redshift and one of the most distant candidate fossil systems. We also show that group-scale systems that act as lenses for ≥3 background sources at different redshifts enable one to estimate the values of the cosmological parameters Ωm and w with an accuracy that is competitive with that obtained from lens galaxy clusters.
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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